Installation? All modern Linuxes have package managers that make installation a headache of the past.

Configuration is a different story. When you are done with a Postgres config you have a more secure setup. They don't allow you to shoot yourself in the foot by default.

Honestly, installation as a differentiator between databases is a seriously weak argument. If you're going to troll pick something a little more technical like acid compliance or something else that nobody seems to care about.